summaryrefslogtreecommitdiff
path: root/net/xfrm/xfrm_policy.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/xfrm/xfrm_policy.c')
-rw-r--r--net/xfrm/xfrm_policy.c140
1 files changed, 134 insertions, 6 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index fdde51f4271a..f623dca6ce30 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -349,12 +349,39 @@ static inline unsigned int idx_hash(struct net *net, u32 index)
return __idx_hash(index, net->xfrm.policy_idx_hmask);
}
+/* calculate policy hash thresholds */
+static void __get_hash_thresh(struct net *net,
+ unsigned short family, int dir,
+ u8 *dbits, u8 *sbits)
+{
+ switch (family) {
+ case AF_INET:
+ *dbits = net->xfrm.policy_bydst[dir].dbits4;
+ *sbits = net->xfrm.policy_bydst[dir].sbits4;
+ break;
+
+ case AF_INET6:
+ *dbits = net->xfrm.policy_bydst[dir].dbits6;
+ *sbits = net->xfrm.policy_bydst[dir].sbits6;
+ break;
+
+ default:
+ *dbits = 0;
+ *sbits = 0;
+ }
+}
+
static struct hlist_head *policy_hash_bysel(struct net *net,
const struct xfrm_selector *sel,
unsigned short family, int dir)
{
unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
- unsigned int hash = __sel_hash(sel, family, hmask);
+ unsigned int hash;
+ u8 dbits;
+ u8 sbits;
+
+ __get_hash_thresh(net, family, dir, &dbits, &sbits);
+ hash = __sel_hash(sel, family, hmask, dbits, sbits);
return (hash == hmask + 1 ?
&net->xfrm.policy_inexact[dir] :
@@ -367,25 +394,35 @@ static struct hlist_head *policy_hash_direct(struct net *net,
unsigned short family, int dir)
{
unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
- unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
+ unsigned int hash;
+ u8 dbits;
+ u8 sbits;
+
+ __get_hash_thresh(net, family, dir, &dbits, &sbits);
+ hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
return net->xfrm.policy_bydst[dir].table + hash;
}
-static void xfrm_dst_hash_transfer(struct hlist_head *list,
+static void xfrm_dst_hash_transfer(struct net *net,
+ struct hlist_head *list,
struct hlist_head *ndsttable,
- unsigned int nhashmask)
+ unsigned int nhashmask,
+ int dir)
{
struct hlist_node *tmp, *entry0 = NULL;
struct xfrm_policy *pol;
unsigned int h0 = 0;
+ u8 dbits;
+ u8 sbits;
redo:
hlist_for_each_entry_safe(pol, tmp, list, bydst) {
unsigned int h;
+ __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
- pol->family, nhashmask);
+ pol->family, nhashmask, dbits, sbits);
if (!entry0) {
hlist_del(&pol->bydst);
hlist_add_head(&pol->bydst, ndsttable+h);
@@ -439,7 +476,7 @@ static void xfrm_bydst_resize(struct net *net, int dir)
write_lock_bh(&net->xfrm.xfrm_policy_lock);
for (i = hmask; i >= 0; i--)
- xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
+ xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
net->xfrm.policy_bydst[dir].table = ndst;
net->xfrm.policy_bydst[dir].hmask = nhashmask;
@@ -534,6 +571,86 @@ static void xfrm_hash_resize(struct work_struct *work)
mutex_unlock(&hash_resize_mutex);
}
+static void xfrm_hash_rebuild(struct work_struct *work)
+{
+ struct net *net = container_of(work, struct net,
+ xfrm.policy_hthresh.work);
+ unsigned int hmask;
+ struct xfrm_policy *pol;
+ struct xfrm_policy *policy;
+ struct hlist_head *chain;
+ struct hlist_head *odst;
+ struct hlist_node *newpos;
+ int i;
+ int dir;
+ unsigned seq;
+ u8 lbits4, rbits4, lbits6, rbits6;
+
+ mutex_lock(&hash_resize_mutex);
+
+ /* read selector prefixlen thresholds */
+ do {
+ seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
+
+ lbits4 = net->xfrm.policy_hthresh.lbits4;
+ rbits4 = net->xfrm.policy_hthresh.rbits4;
+ lbits6 = net->xfrm.policy_hthresh.lbits6;
+ rbits6 = net->xfrm.policy_hthresh.rbits6;
+ } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
+
+ write_lock_bh(&net->xfrm.xfrm_policy_lock);
+
+ /* reset the bydst and inexact table in all directions */
+ for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
+ INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
+ hmask = net->xfrm.policy_bydst[dir].hmask;
+ odst = net->xfrm.policy_bydst[dir].table;
+ for (i = hmask; i >= 0; i--)
+ INIT_HLIST_HEAD(odst + i);
+ if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
+ /* dir out => dst = remote, src = local */
+ net->xfrm.policy_bydst[dir].dbits4 = rbits4;
+ net->xfrm.policy_bydst[dir].sbits4 = lbits4;
+ net->xfrm.policy_bydst[dir].dbits6 = rbits6;
+ net->xfrm.policy_bydst[dir].sbits6 = lbits6;
+ } else {
+ /* dir in/fwd => dst = local, src = remote */
+ net->xfrm.policy_bydst[dir].dbits4 = lbits4;
+ net->xfrm.policy_bydst[dir].sbits4 = rbits4;
+ net->xfrm.policy_bydst[dir].dbits6 = lbits6;
+ net->xfrm.policy_bydst[dir].sbits6 = rbits6;
+ }
+ }
+
+ /* re-insert all policies by order of creation */
+ list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
+ newpos = NULL;
+ chain = policy_hash_bysel(net, &policy->selector,
+ policy->family,
+ xfrm_policy_id2dir(policy->index));
+ hlist_for_each_entry(pol, chain, bydst) {
+ if (policy->priority >= pol->priority)
+ newpos = &pol->bydst;
+ else
+ break;
+ }
+ if (newpos)
+ hlist_add_behind(&policy->bydst, newpos);
+ else
+ hlist_add_head(&policy->bydst, chain);
+ }
+
+ write_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ mutex_unlock(&hash_resize_mutex);
+}
+
+void xfrm_policy_hash_rebuild(struct net *net)
+{
+ schedule_work(&net->xfrm.policy_hthresh.work);
+}
+EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
+
/* Generate new index... KAME seems to generate them ordered by cost
* of an absolute inpredictability of ordering of rules. This will not pass. */
static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
@@ -2862,10 +2979,21 @@ static int __net_init xfrm_policy_init(struct net *net)
if (!htab->table)
goto out_bydst;
htab->hmask = hmask;
+ htab->dbits4 = 32;
+ htab->sbits4 = 32;
+ htab->dbits6 = 128;
+ htab->sbits6 = 128;
}
+ net->xfrm.policy_hthresh.lbits4 = 32;
+ net->xfrm.policy_hthresh.rbits4 = 32;
+ net->xfrm.policy_hthresh.lbits6 = 128;
+ net->xfrm.policy_hthresh.rbits6 = 128;
+
+ seqlock_init(&net->xfrm.policy_hthresh.lock);
INIT_LIST_HEAD(&net->xfrm.policy_all);
INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
+ INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
if (net_eq(net, &init_net))
register_netdevice_notifier(&xfrm_dev_notifier);
return 0;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 11:28:52 +0000